We have 2 Exchange 2010 servers and trying to setup HA/failover using DAG setup with DNS Round Robin
Both servers have mailbox, CAS and Hub roles. We are planning to configure DAG and then setup Network Balancing through DNS Round Robin by creating multiple A records for MX record on the external DNS and internal DNS with minimum TTL. My question is what will happen to the emails in transit if one of the servers goes down ?
I hope this makes sense
Thank you